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SIM.4780040202
SIM.4780040202
http://dx.doi.org/10.1002/SIM.4780040202
The 2 x 2 factorial design: its application to a randomized trial of aspirin and carotene in U.S. physicians.
P356
Q41501749-99D61CA9-2FB4-4D5F-BD5C-E407BCB2A037
P356
SIM.4780040202
http://dx.doi.org/10.1002/SIM.4780040202